A. CAMPESTRIS. 123 



with a few extra lobes along the rachis and hence somewhat pinnately divided, the upper 

 ones simply ternate or undivided, glabrous to somewhat silky-villous and then glabrate 

 at least on upper surface; inflorescence raceme-like or spike-like to loosely paniculate, 

 1 to 5 cm. broad; lower heads peduncled, the upper sessile, mostly nodding, hemispheric; 

 involucre 3 to nearly 4 mm. high, 3.5 to 4 mm. broad, glabrous or nearly so, yellowish 

 green (or brownish), the bracts with brown medial line; disk-flowers apparently 15 to 30, 

 the corolla 2.2 to 2.6 mm. long. {A. borealis Pallas, Reise 3:755, 1776.) Greenland 

 and Hudson Bay to Vermont, western Ontario, Colorado (?), and Washington, thence 

 probably far to the north and northwest, since it is reported from Kotzebue Sound 

 (Hooker, Fl. Bor. Am. 1:327, 1833) and is not rare is Siberia. Type locality, Siberia. 

 Collections: Grand Falls, Newfoundland, on ledges and talus, Fernald and Wiegand 

 6S88 (DS, Gr, UC) ; Gasp^ County, Quebec, on serpentine detritus, Collins and Fernald 

 145 (NY, UC, US) ; Gasp6 County, Quebec, on cliffs, Collins, Fernald, and Pease 6183 

 (UC); Mount Mansfield, Vermont, Egglesion 2027a (NY); Mount Harvard, Colorado, 

 Clements 31 (NY, referred here because of the glabrous involucres, but doubtless a local 

 derivative of subspecies spithamaea) ; near Banff, Alberta, McCalla 2016 (US, type of 

 A. maccallae Rydberg, minor variation 22); White Horse Rapids, Yukon River, Macoun 

 79015 (NY, same variation). 



21e. Artemisia campestris spithamaea (Pursh). — Root perennial; stems several, 

 crowded on the crown, 1 to 4 dm. high, erect or ascending, the base often spreading, 

 densely leafy below, less so up into the inflorescence; leaves once or twice ternately or 

 somewhat pinnately divided into short linear or linear-oblanceolate divisions, the upper 

 ones less divided or entire, all densely silky-pubescent; inflorescence spike-hke, very dense 

 towards the summit, about 0.5 to 1.5 cm. broad, or closely paniculate and up to 4 cm. 

 broad (form = ^. bourgeauana Rydberg, minor variation 5); heads sessile or subsessile, 

 erect to nodding, hemispheric; involucre about 4 mm. high, 4 to 5 mm. broad, densely vil- 

 lous, brownish except where covered by the gray pubescence; disk-flowers 15 to 20 or 

 more, the corollas about 3 mm. long. {A. spithamaea Pursh, Fl. Am. Sept. 522, 1814.) 

 Greenland and the Arctic coast to Quebec and in the mountains to Colorado and northern 

 Oregon, thence northwest to the Aleutian Islands and Kamchatka. Type locality, 

 Labrador. Collections: Near Fyllas, Greenland, August 2, 1884, Warming and Holm 

 (Gr); Nikok, western Greenland, August 10, 1907, Hansen (hb. Blankinship) ; island of 

 Omenak, Greenland, White and Schuchert 163 (US, intermediate to subspecies borealis, 

 some involucres glabrous, some moderately pubescent with long loose hairs) ; Rama, 

 Labrador coast, Sornborger 62 (Gr, US, intermediate to subspecies borealis); Okkak, 

 Labrador, Moravian Fathers (Gr); on serpentine, Mount Albert, Quebec, Fernald and 

 Collins 268 (NY); northwestern Wyoming, Rose 655 (US); Cameron Pass, Colorado, 

 July 31, 1896, Baker (NY, UC); high mountains about Empire, Colorado, Patterson 215 

 (Gr, NY, UC); Crestone's, Sangre de Cristo, Colorado, September, 1877, Brandegee 

 (UC); Mount Henry, Montana, Umbach 612 (NY, US); gravelly banks of the Columbia 

 River, Wasco County, Oregon, April 14, 1886, Suksdorf (Gr) ; Biggs, Oregon, near the 

 banks of the Columbia River, May 31, 1910, Heller (NY, UC, type collection of A. ripi- 

 cola Rydberg, minor variation 29) ; summit of Olympic Mountains, Washington, August 

 28, 1898, Flett (US); Cold Bay, Alaska, Piper 4223 (US, type of A. manca Rydberg, 

 minor variation 23); Petropaulovski, Kamchatka, 1853-56, Wright (Gr, with inter- 

 mediates to borealis). 



21/. Artemisia campestris pycnocephala (Lessing). — Root perennial; stems several 

 or numerous on a stout woody caudex, 2 to 6 dm. high, erect, very leafy up to the inflor- 

 escence; leaves twice or thrice pinnately divided into linear or linear-spatulate divisions 

 0.5 to 1 mm. wide, densely and permanently silky-villous; inflorescence a strict virgate 



